My husband filed a divorce case from California. Can I request CA court to transfer case to nevada( my residency state) because of my pregnancy(18week

Well, "transfer" is not really how such things work. You don't supply enough information to do an analysis of what jurisdiction was or is the proper one to hear the action, or even what kind of action it is.  You should probably look at "The Basics of Family Law Jurisdiction" which is posted here.  If it does not answer your questions, feel free to call to ask any follow-up questions you might have as to your options.